Medtronic is a medical device company working mainly in the United States. It is an American-Irish registered company. It transferred its legal registration from the U.S. to Ireland following the acquisition of Irish–tax registered Covidien in 2015. As a result, the Wall Street Journal named Medtronic the largest U.S. corporate tax inversion executed between 2013 and 2016. The number of employees reaches roughly 105,000. The brand works in 140 countries and territories.